Portion of a faucet



FIG. 1 is a perspective view thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side view, the left side view being identical; and,

FIG. 4 is a top view thereof.

The broken lines showing of environmental structure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a faucet, as shown and described. 